Bicycle-pum.



Patented Oct. 3l, |899.

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l F. H. vDEKNA-TEL &. C. J. SPRUCE.

BICYCLE PUMP.

(Application led Jan. 28, 1899.)

'um Model.)

UNITED STATES PATENT OEErcE.

FREDERICK H. DEKNATEL, OF CHICAGO, AND CLIFFORD J. SPRUCE, OF

AUSTIN, ILLINOIS, ASSIGNORS TO THE MACKIE-LOVEJ OY MANUFAC- TURING COMPANY, OF CHICAGO, ILLINOIS.

BICYCLE-PUMP.

SPECIFICATION forming-part of Letters Patent No. 636,1 18, dated October 31, 1899.

Application led January 28, `1899. Serial No. 703,702. (No model.) I

To all whom it may concern,.-

Be it known that we, FREDERICK H. DEK- NATEL, residing at Chicago, and CLIFFORD J. SPRUCE, residing at Austin, in the county of Cook and State of Illinois, citizens of the United States, have invented certain new and useful Improvements in Bicycle-Pumps, of which the Afollowing is a specification.

This invention relates to that class of pumps which is used for compressing air and forcing it into an inflatable vehicle-tire, and

from an examination of the drawings and the following description and claims.

The invention consists principally in the combination of a cylinder, a movable piston therein, an extensible and collapsible pistonrod secured to the piston, and means for operatively holding the piston-rod in its extended and collapsed conditions.

It consists, further and iinally, in the features, combinations, and details Vof const-ruction hereinafter described and claimed.

In the accompanying drawings, Figure 1 is sectional elevation of a complete pump constructed in accordance with our improvements; Fig. 2, a full-sized broken sectional elevation of the upper part of the collapsible piston-rod; Fig. 3, a similar View of the lower part; Fig. 4, a developed surface View of the inner portion of the upper part of the tubular piston-rod; Fig. 5, a sectional elevationof the upper part of the lower portion of the piston-rod and the lower part of the upper portion of the piston-rod, showing the means for operatively holding them together in their extended condition; and Fig. 6, a plan view of the upper part of the tubular portion of the piston-rod.

In the art to which this invention relates it is well known that a foot-pump is most desirable for the purpose of inflating a bicycle or other vehicle-tire, but that owing to its size it is heavy and cumbersome to handle and practically impossible to carry in the toolbag, and consequently that the small handpump is the usual one carried by cycling tourists.

In constructing a bicycle-pump in accordance with our improvements we use a cylinder A, provided with a reciprocating piston B, which during its reciprocations compresses the air between it and the walls of the cylinder. This cylinder is provided with an outlet-tube C, which may be connected in any usual manner with the valve of a bicycle-tire for the purpose of confining and guiding compressed air from the compressing-chamber of the pump to the tire. To use the tire with the foot, a stirrup D is provided, which is preferably pivotally secured to the cylinder.

It is highly desirable to provide this pump with a piston-rod, whereby it may be used either by hand alone or in combination with the hand and foot. In order to accomplish this result, we make a collapsible and extensible piston-rod in twoA parts E and E'. E is a tubular part, which is rigidly secured to the movable piston and which at its upper end and on the inside is provided with two semicylindrical shells G, curved at their lower parts at g and separated to such an extent as to provide diametrically-opposed channels g. The upper part of these semicyliudrical shells are camshaped, as at g2, and provided with locking-recesses g3, the purpose of which will more fully hereinafter appear. The portion 'E' of the piston-rod may be either tubular or solid and is inserted telescopically in the lower tubular part and provided with cushioned Washers formed of the upper and lower rings e2 and e3 and the interposed cushion e6, preferably formed of rubber. A pin e5 is inserted diametrically throughv the lower part of the upper portion of the piston-rod, 95 though it may be lugs formed integrally therewith, so that it may pass through the channel between the semicylindrical shellsand be turned at right angles, so as to ride on the upper cam-like surface and engage with the IOO locking-notches, thereby operatively holding the piston-rod in its extended condition. To hold it in its collapsed condition, the exterior of the loweil tubular portion is provided with an outer threaded portion ciladapted to engage with the threaded recess H in the handle H when the parts are in their collapsed condition and operatively hold them yin such condition.

In operation when it is desired to use the pump by hand alone the stirrup is folded back against the cylinder (see dotted outline, Fig. l) and the air-tube connected with the tire. The piston-rod is collapsed and secured together in its collapsed condition, so that the pump may be used in such condition, which is its smallest. To use it with both hand and foot, the stirrup is swung down so that the foot may rest upon it and the piston-rod extended and operatively secured together in its extended position, as above outlined, thus permitting` the operator or user to use it by hand and foot in its largest condition, and thereby obtain the greatest a mount of power.

We claim- 1. In a pump of the class described, the combination of a cylinder portion, a piston movably mounted therein, a collapsible and extensible piston-rod secured to the movable piston, and means for operatively holding the piston-rod in its collapsed and extended condition, substantially as described.

2. In a pump of the class described, the combination of a cylinder, a piston movably mounted therein, a collapsible and extensible piston-rod secured to the movable piston and made in two parts-a tubular portion and a second portion inserted therein, alug or lugs extending diametrically out from the second part and adapted to bear on the end of the tubularportion to operatively hold the pistonrod in its extended condition, and means for operatively holding the piston-rod in its collapsed condition, substantially as described.

3. In a pump of the class described, the combination of a cylinder portion, a piston movably mounted therein, a collapsible and extensible piston-rod secured to the movable piston-rod and formed of two parts-a lower tubular part and an upper part telescopically inserted in the lower tubular part, two semicylindrical shell portions inserted in the upper edge of the tubular portion and providing a longitudinal channel between them, an upper cam-surface and locking-notch in the semicylindrical shells, a cushioned washer on the lower end of the upper part of the pistonrod, a pin, pins or similar element extending diametrically out from the upper portion of the piston-rod, whereby the pin may engage with the locking-notches in the tubular part of the piston-rod and hold it inits extensible condition, and a handle provided with means adapted to engage the tubular portion and lock and operatively hold the pistou-rod in its collapsible condition, substantially as described.

4. In a pump of the class described, the combination of a cylinder portion, a piston movably mounted therein, a collapsible and extensible piston-rod secured to the movable piston-rod and formed of two parts-a lower tubular part and an upper part telescopically inserted in the lower tubular part, two semicylindrical shell portions inserted in the upper edge ofthe tubular portion and providing a longitudinal channel between them, an upper ca m-surface and lockin g-notch in the semicylindrical shells, a cushioned washer on the lower end of the upper part of the piston-rod, a pin or pins or similar element diametrically extending through the upper port-ion of the piston-rod, whereby the pin may engage with the locking-notches in the tubular part of the piston-rod and hold it in its extensible condition, an outer threaded portion on the tubular part, and a handle provided with athreaded portion adapted to engage the outer threads on the tubular portion and lock and operatively hold the piston-rod in its collapsible condition, substantially as described.

FREDERICK H. DEKNATEL. CLIFFORD J. SPRUCE. IVitnesses:

OHAs. MACKIE, Mrs.' J. R. DUNLAP. 

